I've been carrying my P-3at daily for the last 6 weeks. When I work around the house it's with me. Dirty, dusty work then shoot it 20-30 rounds (Using various ammo) back in the pocket (in a nemesis). More dust, lint etc. shoot it some more a week later. Back in the pocket, I almost felt sorry for it but this was a test. See all the lint building up on the back of the hammer, shoot it some more, and back in the pocket, with a M+P 9C for backup because I do know if I can trust it at this point. Finally, after about 150 rounds over 6 weeks time (and lots of dirt) I just had to clean it. Since the trip back to the factory even without a fluf/buff it is working flawlessly.